What we're dealing with here is the beginning sound of the word. M , of course, is a consonant, but when we say the letter, the initial sound is a vowel (emmm). Which to use when writing is up to the individual.
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Anonymous In the case of MBA, M is used in place of Masters, so you would use a, not an.M is pronounced 'em'. So it should be an MBA. You are misleading members.